प्रोग्राम की सुविधाएँ · ऑयलर टोटिएंट गणना

def totient(value):
    if type(value) is not int or not 1 <= value <= 1000000000:
        raise ValueError("value.range")
    remaining, result, factor = value, value, 2
    while factor * factor <= remaining:
        if remaining % factor == 0:
            result -= result // factor
            while remaining % factor == 0:
                remaining //= factor
        factor += 1
    if remaining > 1:
        result -= result // remaining
    return result